GE Oven Error Code F63

F63 on a GE oven with Machine Control means the User Interface board has lost communication with the lower machine control board. It is a serial communication fault, not a heating or sensor problem. The two main control boards in the oven are not exchanging signals, which prevents normal operation.

No, you should not attempt to use the oven while F63 is active. The User Interface and lower machine control are not communicating, which means the oven may not respond to controls correctly or may not be able to shut off heating functions safely. Discontinue use until the fault is diagnosed and repaired.

If the fix is simply reseating a harness connector, there is no parts cost and only a service call fee if a technician is involved. Replacing a control board typically costs between $150 and $350 for the part, depending on the specific GE model, plus labor if professionally installed. User Interface boards and machine control boards are generally available as individual parts, so you only need to replace the board that failed based on the LED diagnostic.

Start by checking the wiring harness and connectors at J700 and J5 on the User Interface board. Reseat any loose connectors and inspect the harness for damage. If the connections are good, check for a status LED on each board while the oven is powered. Whichever board shows no LED is the one that needs to be replaced. If you are not comfortable working around live appliance wiring, a technician should perform the board diagnostics and replacement.

You can attempt a reset by disconnecting the oven from power for several minutes, then restoring power. If a connector was temporarily loose, this may allow the boards to re-establish communication. However, if the harness is damaged or a board has failed, the code will return and a physical inspection is necessary.